rubber. natural rubber is.......type of polymer. polyamide polyester polyene polyether
TRANSCRIPT
Rubber
Natural Rubber is .......type of polymer.
• Polyamide • Polyester • Polyene• Polyether
Nature rubber is obtained form the tree named
• Hevea brazilensis• Hevea crailensis• Heated brazilensis• None of these
Rubber is kept in smokehouse for 3days at50°C to
• Increases tensile strength• Increases impact strength• Increases resilience• Increases resistance to attack by micro
organism
A Synthetic rubber P Cis-1,4polyisoprene
B Natural rubber Q Trans-1,4polyisoprene
C Gutta-percha R Sulphur crosslinked rubber
d Vulcanized rubber s Styrene –butadiene rubber
a a)-r, b)-p,c)-q ,d)-s
b a)-s, b)-p, c)-r,d)-q
c a)-s, b)-p, c)-q,d)-r
d a)-p,b)-s, c)-q,d)-r
For application like making of tyres,conveyer belts,insulation---- is used
• Natural rubber• Vulcanised rubber• Styrene butadiene rubber• None of these
SBR is an example of
• Copolymer• Condensation polymer• Thermosetting polymer• Branched polymer
Styrene butadiene rubberis prepared by co-polymerisation of
• 90%butadiene+10%styrene by weight• 75%butadiene+25%styrene by weight• 25%butadiene+7510%styrene by weight• 10%butadiene+90%styrene by weight
Styrene and butadiene monomerson polymerization form
• Homopolymer• Copolymer• Croslinked polymer• Inorganic polymer
Mastication of rubber polymer chains is carried out on
• Rollers that are hollow to circulate polymer chains
• Rollers that are hollow to circulate hot and cold water
• Rollers that are hollow to circulate heat generated
• Rollers that are rigid heavy to apply pressure